Class: PacketGen::Header::Dot1q

Inherits:

Base

• Object
• BinStruct::Struct
• Base
• PacketGen::Header::Dot1q

Defined in:

lib/packetgen/header/dot1q.rb

Overview

IEEE 802.1Q VLAN tagging

A VLAN tag consists of:

• a Tag Control Information (BinStruct::Int16),

• a #ethertype (BinStruct::Int16),

• and a body (a BinStruct::String or another PacketGen::Headerable class).

Examples:

Create a Dot1q header

# Create a IP packet in VLAN #43
pkt = PacketGen.gen('Eth').add('Dot1q', vid: 43).add('IP')
pkt.is?('Dot1q')   #=> true

Author:

• Sylvain Daubert

Since:

• 1.4.0

Instance Attribute Summary

• #body ⇒ BinStruct::String, Header::Base
• #dei ⇒ Boolean

  Drop Eligible Indicator from #tci.

• #ethertype ⇒ Integer

  16-bit EtherType.

• #pcp ⇒ Integer

  3-bit Priority Code Point from #tci.

• #tci ⇒ Integer

  16-bit Tag Control Information.

• #vid ⇒ Integer

  12-bit VLAN ID from #tci.

Method Summary

Methods inherited from Base

bind, calculate_and_set_length, #header_id, inherited, #initialize, #ip_header, #ll_header

Methods included from PacketGen::Headerable

#added_to_packet, included, #method_name, #packet, #packet=, #parse?, #protocol_name, #read, #to_s

Constructor Details

This class inherits a constructor from PacketGen::Header::Base

Instance Attribute Details

#body ⇒ BinStruct::String, Header::Base

Returns:

• (BinStruct::String, Header::Base)

# File 'lib/packetgen/header/dot1q.rb', line 39

define_attr :body, BinStruct::String

#dei ⇒ Boolean

Returns Drop Eligible Indicator from #tci.

Returns:

• (Boolean) —

  Drop Eligible Indicator from #tci

# File 'lib/packetgen/header/dot1q.rb', line 33

define_bit_attr :tci, pcp: 3, dei: 1, vid: 12

#ethertype ⇒ Integer

Returns 16-bit EtherType.

Returns:

• (Integer) —

  16-bit EtherType

# File 'lib/packetgen/header/dot1q.rb', line 36

define_attr :ethertype, BinStruct::Int16

#pcp ⇒ Integer

Returns 3-bit Priority Code Point from #tci.

Returns:

• (Integer) —

  3-bit Priority Code Point from #tci

# File 'lib/packetgen/header/dot1q.rb', line 33

define_bit_attr :tci, pcp: 3, dei: 1, vid: 12

#tci ⇒ Integer

Returns 16-bit Tag Control Information.

Returns:

• (Integer) —

  16-bit Tag Control Information

# File 'lib/packetgen/header/dot1q.rb', line 33

define_bit_attr :tci, pcp: 3, dei: 1, vid: 12

#vid ⇒ Integer

Returns 12-bit VLAN ID from #tci.

Returns:

• (Integer) —

  12-bit VLAN ID from #tci

# File 'lib/packetgen/header/dot1q.rb', line 33

define_bit_attr :tci, pcp: 3, dei: 1, vid: 12